GD bbPress Toolbox Pro

Modules:

SEO Tools

The plugin has set of tools aiming to improve SEO for the bbPress forums. Some tools will help you solve issues that some specialized SEO plugins might have.

Topic / Reply SEO Settings

For topics and replies you can control meta title and excerpt. For private topics and replies, you can replace normal excerpt with the custom version pointing out that content is private. And, you can add meta description tag into page header.